JP3248827B2 - Engine generator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an engine generator which suppresses engine speed fluctuations and constantly controls the output power of the generator, and more particularly to a control device for an exciting current based on a crankshaft speed and a load voltage. By controlling, the required torque of the generator is constantly controlled to optimize engine efficiency,
The present invention relates to a control device for an engine generator, which easily realizes low noise, improved fuel efficiency and purification of exhaust gas.

[0002]

2. Description of the Related Art FIG.
It is a block diagram which shows the schematic structure of the control apparatus of the conventional engine generator (actuation generator) described in No. 0 publication. In the figure, a control unit 1 controls an opening degree of a throttle valve 4 (corresponding to an intake air amount of an engine 6) in response to an output signal C from a calculation unit 13 (described later). The drive unit 2 supplies a drive voltage (DC voltage) corresponding to the output signal C from the calculation unit 13 to the actuator 3 under the control of the control unit 1.

An actuator 3 drives a throttle valve 4 in accordance with a DC voltage from a drive unit 2. The throttle valve 4 is driven to open and close by the actuator 3 to set an opening degree, and adjusts an intake air amount of the engine 6. The braking spring 5 generates a braking torque for fixing the opening of the throttle valve 4 in a state of being balanced with the driving torque of the actuator 3, and fully closes the throttle valve 4 when the actuator 3 is not operated.

The number of revolutions of the crankshaft of the engine 6 is controlled by the amount of intake air supplied according to the opening of the throttle valve 4. Generator 7 consisting of a three-phase synchronous magnet generator
Includes a three-phase coil (not shown) of a rotor portion connected to an output shaft of the engine 6 and an exciting coil (not shown) of a stator portion, and generates a high-frequency voltage composed of a three-phase sine wave as an output voltage Vg. I do. The rectifier circuit 8 includes the generator 7
Output voltage Vg is subjected to three-phase full-wave rectification to obtain a DC load voltage Vd.
Convert to

[0005] An inverter circuit 9 acting as a load of the generator 7 converts the load voltage Vd generated from the rectifier circuit 8 into a sine wave of a commercial frequency and converts it into a load (not shown) such as another electric device. Supply. The load voltage Vd is equal to other loads,
For example, the voltage is also supplied to a battery serving as a power source mounted on an automobile, and indicates a voltage value corresponding to a resistance value of a load.

The output signal C as an instruction to the control unit 1
The comparison unit 11 detects the load voltage Vd (corresponding to the output voltage Vd of the generator 7) output from the rectifier circuit 8 and compares it with the set voltage Vr (target voltage).
And an operation unit 13 that performs an operation based on the comparison result of the comparison unit 12 to generate an output signal C.

Although not shown here, various sensor means for detecting various information indicating the operating state of the engine 6 and for controlling the fuel injection amount and the ignition timing of the engine 6 according to the operating conditions. A general engine control device is provided. Further, the control unit 1, the driving unit 2, and the comparison operation unit 11 constitute an electronic control unit 30, and control the engine control device based on various information.

FIG. 15 shows the electronic control unit 30 shown in FIG.
FIG. 2 is a circuit diagram showing a specific configuration example of FIG. 1. In the figure, a comparison operation unit 11 includes an operational amplifier O that takes in a set voltage Vr.
It comprises P1, the input resistors R1 to R3 and the feedback resistor R4 of the operational amplifier OP1, the operational amplifier OP3 for taking in the load voltage Vd, and the input resistor R7 and the feedback resistor R8 of the operational amplifier OP3. Operational amplifier OP
3 is supplied to an operational amplifier O via an input resistor R2.
It has been input to P1.

The driving section 2 includes an operational amplifier OP2 for receiving an output signal of the operational amplifier OP1, and an operational amplifier OP
It comprises two input resistors R5 and a feedback resistor R6. The output signal of the operational amplifier OP2 is input to the operational amplifier OP1 via the input resistor R3. Further, the output signal of the operational amplifier OP2 in the drive unit 2 is supplied to the actuator 3, and the output shaft of the actuator 3 is
The engine 6 is connected to a throttle valve 4 rotatably disposed in an intake pipe of the engine 6.

Next, the operation of the conventional engine generator control device shown in FIGS. 14 and 15 will be described. Generally, the resistance value of the load including the battery and the inverter circuit 9 is, for example, 8 if the output power Pg of the generator 7 is 20 kW, the load voltage Vd is 400 V, and the load current is 50 A.
It is about Ω, but fluctuates depending on the state of charge of the battery, the input of electric equipment, and the like. When the load voltage Vd fluctuates in accordance with the fluctuation of the load resistance value, the required torque of the generator 7 fluctuates, and the magnitude of the load viewed from the engine 6 fluctuates.

Since the output voltage Vg of the generator 7 depends on the load including the inverter circuit 9, the control of the number of revolutions of the crankshaft is performed by, for example, controlling the output power of the generator 7 and controlling the opening and closing of the throttle valve 4. If not, Engine 6
Will change in accordance with the load. If the rotational speed of the crankshaft of the engine 6 fluctuates greatly according to the load fluctuation, the engine 6 cannot continue to be operated with high efficiency, and the output electric machine Pg of the generator 7 cannot be kept constant.

Therefore, conventionally, the electronic control unit 30 sets the crankshaft rotation speed to, for example, 2000 rpm to
In order to operate the engine 6 at a high efficiency of about 2500 rpm, the opening of the throttle valve 4 is controlled in accordance with a change in the load voltage Vd corresponding to the resistance value of the load.
Is changing the amount of intake air. In this case, it is assumed that the exciting current supplied to the exciting coil in the generator 7 is controlled to be constant.

That is, the electronic control unit 30 detects the load voltage Vd, compares it with the set voltage Vr, generates an output signal C by an operation based on the comparison detection, drives the actuator 3, and drives the actuator 3 to open the throttle valve 4. Is controlled to control the fluctuation of the rotation of the engine 6 and to control the output power of the generator 7 constantly.

In this case, the control unit 1 drives the actuator 3 via the drive unit 2 according to the output signal C specified by the calculation unit 13 in the comparison calculation unit 11. As a result, the actuator 3 generates a driving torque corresponding to the DC voltage supplied from the driving section 2, drives the throttle valve 4 to open and close, and controls the intake air amount of the engine 6.

At this time, the braking force of the actuator 3 by the braking spring 5 changes in accordance with the rotation angle of the throttle valve 4, and when the braking torque and the driving torque of the actuator 3 are balanced, the rotation of the throttle valve 4 is reduced. Stop.
Thus, the opening degree of the throttle valve 4 is controlled by changing the driving torque of the actuator 3 and the engine 6
Control the amount of intake air (fuel gas) supplied to the
The crankshaft rotation speed is controlled to be constant.

For example, if the load voltage Vd rises above the set voltage Vr, the resistance value of the load is high (the load is small).
Therefore, since the required torque of the generator 7 is small, the opening of the throttle valve 4 is controlled to the closed side in order to suppress an increase in the crankshaft rotation speed. Conversely, if the load voltage Vd decreases below the set voltage Vr, the resistance value of the load is small (the load is large), and the required torque of the generator 7 is large. Then, the opening of the throttle valve 4 is controlled to the open side.

The rotational output of the engine 6 is taken out as rotational energy of the output shaft, and a generator 7 connected to the output shaft outputs an output voltage V according to the crankshaft rotation speed.
g. The output voltage Vg of the generator 7 is
, Is supplied to a load such as a battery, and is finally converted again to a sine wave of commercial frequency (AC output equivalent to commercial power) via an inverter circuit 9. Is supplied to loads such as electrical equipment.

The comparison operation unit 11 in the electronic control unit 30
Detects a load voltage Vd corresponding to the output voltage Vg of the generator 7 by a load voltage detecting means (a voltage dividing circuit, not shown) connected to the rectifier circuit 8 and compares the load voltage Vd with a predetermined set voltage Vr in the comparing unit 12. I do. The operation unit 13 in the comparison operation unit 11 performs a predetermined operation based on the comparison result from the comparison unit 12 and supplies the operation result to the control unit 1 as an output signal C.

More specifically, the load voltage Vd is supplied to the operational amplifier OP of the preceding stage in the comparison operation unit 11 through the input resistor R7.
3 (see FIG. 15), becomes an operation-amplified output signal, and is input to a subsequent operational amplifier OP1. Also,
The set voltage Vr is input to the operational amplifier OP1 via the input resistor R1, and the output signal of the operational amplifier OP2 in the drive unit 2 is feedback input via the input resistor R3. As a result, the load voltage Vd and the set voltage Vr are compared in the operational amplifier OP1.

For example, when the drive voltage for the actuator 3 decreases based on the comparison result, the throttle valve 4 is driven to the closing side, the crankshaft rotation speed of the engine 6 decreases, and the output power of the generator 7 also decreases. Decrease.

In this way, the comparison operation section 11 performs an operation based on the output voltage Vg of the generator 7, and generates an output signal C as a result of the operation. Thereby, the control unit 1 controls the opening of the throttle valve 4 to control the crankshaft rotation speed of the engine 6. Therefore, the rotation speed of the crankshaft of the engine 6 is controlled according to the increase or decrease of the load voltage Vd corresponding to the output voltage Vg of the generator 7.

[0022]

As described above, the conventional engine generator control system always keeps the opening of the throttle valve 4 constant with the excitation current of the generator 7 constant with respect to the fluctuation of the load voltage Vd. Since the crankshaft rotation speed of the engine 6 is controlled by changing the speed, the amount of intake air changes rapidly due to the rapid change control of the throttle valve 4, so that there is a problem that purification of exhaust gas cannot be realized.

Further, since the opening and closing of the throttle valve 4 is controlled after detecting the change in the load voltage Vd, the change in the intake air amount due to the opening and closing of the throttle valve 4 is much slower than the change in the required torque of the generator 7. As a result, a non-response time of the control system such as a control delay until the change is reflected in the actual intake air amount occurs, and the crankshaft rotation speed pulsates due to hunting, and it is difficult to control the crankshaft rotation speed constantly. There was a problem of becoming.

The present invention has been made to solve the above-described problems. When the output power of the generator can output the rated power, the opening of the throttle valve is changed even if the load voltage fluctuates. The generator is driven at the optimum efficiency rotation speed with almost no change in the crankshaft rotation speed so that a constant generated output power is obtained, and the generator is operated at the crankshaft rotation speed that maximizes the engine efficiency Accordingly, it is an object of the present invention to obtain a control device for an engine generator, which realizes optimization of engine efficiency, reduction of noise, improvement of fuel efficiency, and easy purification of exhaust gas.

Further, according to the present invention, when the output power of the generator is less than the rated power, the opening / closing control speed of the throttle valve is always kept constant, so that the improvement of fuel efficiency and the purification of exhaust gas are easily realized. It is an object of the present invention to obtain a control device for an engine generator.

[0026]

A control device for an engine generator according to the present invention comprises: a throttle valve for adjusting an intake air amount of an engine; an engine control device for controlling a fuel injection amount and an ignition timing for the engine; An actuator for adjusting the opening of the valve, a generator for generating electric power by the rotation output of the engine, a rectifying circuit for rectifying the output voltage of the generator to generate a DC load voltage, and a generator for applying the load voltage And an electronic control unit that controls an exciting current for the generator, an engine control device and an actuator based on various information indicating the operating state of the engine, and the various information includes a resistance of the load. The electronic control unit includes the target output of the generator for the load voltage, including the load voltage corresponding to the value and the crankshaft speed of the engine. Target output power setting means for map setting power; target torque setting means for map setting target torque required by the generator to obtain target output power based on load voltage and crankshaft rotation speed; Excitation current calculation means for calculating the excitation current of the generator so that the required torque of the generator coincides with the target torque, and excitation current control means for driving an excitation coil in the generator so as to obtain the calculated excitation current. In addition, the required power of the generator is controlled to be constant at the target torque, the output power is controlled to be constant at the target output power, and the engine is operated at a crankshaft rotation speed at which the output efficiency of the engine is maximized.

[0027] The control device for an engine generator according to the present invention includes an exciting current detecting means for detecting an exciting current supplied to the generator, and an exciting current based on a difference between a detected value of the exciting current and a calculated value. And an exciting current correction means for finely adjusting

Further, the control device for the engine generator according to the present invention determines whether or not the output power of the generator is equal to or higher than the rated power.
Load fluctuation determining means for determining whether the load voltage is within a predetermined range, and when it is determined that the load voltage is not within the predetermined range and the output power of the generator is less than the rated power,
Ignition timing correction means for correcting the ignition timing of the engine so that the crankshaft rotation speed matches the target rotation speed.

Further, the control device for an engine generator according to the present invention determines whether or not the output power of the generator is equal to or higher than the rated power.
Load fluctuation determining means for determining whether the load voltage is within a predetermined range; and, when the load voltage is not within the predetermined range and the output power of the generator is less than the rated power, the crankshaft rotation speed is reduced to the target rotation speed. An opening correction means for controlling the opening of the throttle valve to a closed side at a constant speed so as to match the number.

Further, the engine generator control device according to the present invention includes an output torque estimating means for estimating the engine output torque based on the opening degree and the boost pressure (intake manifold pressure); Target opening calculating means for performing a map interpolation calculation of the target opening of the throttle valve based on the relationship with the output torque, wherein the opening correcting means includes a crank when the output power of the generator is less than the rated power. The opening of the throttle valve is controlled to the target opening so that the shaft rotation speed matches the target rotation speed.

[0031]

According to the present invention, as long as the output power of the generator can output the rated power, even if the output voltage changes in accordance with the load state, the output power is determined based on the load voltage and the crankshaft rotation speed. The exciting current of the generator is controlled to control the generator so as to have a constant target output power (constant torque). As a result, the load torque viewed from the engine is controlled to be constant without controlling the opening and closing of the throttle valve, thereby suppressing rotation fluctuation and pulsation of the engine. In addition, by controlling the required torque of the generator with the target torque at a constant torque and suppressing the engine rotation fluctuation, optimization of engine efficiency, improvement of fuel efficiency and purification of exhaust gas can be easily realized.

Further, in the present invention, the exciting current is finely adjusted based on the difference between the detected value of the exciting current supplied to the generator and the calculated value, thereby compensating for the temperature drift and the like of the resistance value of the exciting coil.

Further, in the present invention, even when the control error between the target torque of the generator and the required torque is not completely zero, the ignition timing of the engine is adjusted so that the crankshaft rotation speed matches the target rotation speed. There is almost no need to change the opening of the throttle valve to compensate for the retard or advance. Thus, regardless of the interpolation calculation accuracy of the map data, the crankshaft rotation speed is maintained so that the generator has the optimum efficiency, and the point operation at which the engine efficiency is maximized is maintained to obtain a constant output power.

According to the present invention, when the output power of the generator is less than the rated power, the opening of the throttle valve is shifted to the closing side at a constant speed so that the crankshaft rotation speed matches the target rotation speed. Control. As a result, even when the load voltage fluctuates and the output power of the generator does not reach the rated power, rotation pulsation of the engine is suppressed and constant rotation control is performed, and purification of exhaust gas is realized.

Further, according to the present invention, the current engine output torque is estimated based on the throttle valve opening and the engine boost pressure, and the target opening of the throttle valve is subjected to a map interpolation calculation so that the output power of the generator is reduced. If the rated power is not reached, control the throttle valve opening to the target opening so that the crankshaft rotation speed matches the target rotation speed, and then allow for the delay time of the intake air amount, and then Then, the power of the generator is reduced. As a result, the throttle valve is controlled in advance to the closing side before the required torque of the generator decreases due to the reduction of the load, the rotational pulsation of the engine is suppressed, and the constant rotation is controlled. Realize gas purification.

[0036]

【Example】

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention, in which a drive section 2, a throttle valve 4, an engine 6, and an inverter circuit 9 are the same as those described above.

The electronic control unit 30A has a configuration corresponding to the electronic control unit 30 described above, and includes, as various kinds of information, the opening degree θ of the throttle valve 4, the crankshaft rotation speed Ne of the engine 6, and the boost pressure PB ( Intake pressure) and the load voltage Vd.

Here, in order to improve maintainability and reliability, for example, a DC brushless motor is used as the actuator 3.
A drive torque is generated in proportion to the three-phase current supplied from the drive unit 2 to drive the throttle valve 4 of the engine 6.
The drive unit 2 of the actuator 3 is configured by a full bridge circuit using a power FET.

The opening θ of the throttle valve 4 is detected by an opening sensor constituted by, for example, a variable resistor (to be described later), and is controlled by the control operation unit 14 in the electronic control unit 30A.
Has been entered. The engine control device 10 controls the fuel injection amount and the ignition timing of the engine 6 in response to a control signal from the control calculation unit 14, and performs ignition timing correction and the like. Data communication is performed between the engine control device 10 and the control calculation unit 14.

The control operation unit 14 composed of a microcomputer corresponds to the control unit 1 and the comparison operation unit 11 described above, and includes the opening degree θ of the throttle valve 4, the crankshaft rotation speed Ne of the engine 6, the load voltage Vd, The excitation current Im of the generator 7 is detected, and the opening degree θ of the throttle valve 4 is determined.
, The fuel injection amount of the engine 6, the ignition timing, and the like.

The opening θ of the throttle valve 4 is determined by the control
The feedback control is performed by the control unit 4 so that the intake air amount of the engine 6 is arbitrarily controlled. Also,
The throttle valve 4 is provided with a spring (not shown) that acts on the fully closed side when no power is supplied, so that when the actuator 3 fails, the throttle valve 4 is fully closed and the engine 6 stops. Fail safe.

The drive unit 15 supplies the exciting current Im to the generator 7 in response to the control signal from the control calculation unit 14.
The exciting current detecting section 16 outputs the exciting current I via the driving section 15.
m is detected and input to the control operation unit 14. The drive unit 2, the control operation unit 14, the drive unit 15 for supplying the excitation current Im, and the excitation current detection unit 16 of the actuator 3 are configured in the electronic control unit 30A.

FIG. 2 is a circuit block diagram showing a specific configuration of the generator 7, the rectifier circuit 8, and the control operation section 14 to the excitation current detection section 16 in FIG. In FIG. 2, the generator 7
Have exciting coils 71 and 72 to which an exciting current Im is supplied in parallel and a stator coil 73. The excitation coils 71 and 72 in the generator 7 are subjected to PWM (pulse width modulation) control by the drive unit 15, and the output power Pg and the required torque Tg of the generator 7 are set to arbitrary values by controlling the excitation current Im. It can be set.

The drive section 15 has a power transistor 19 having a common emitter and a resistor R connected to the base of the power transistor 19. Excitation current detector 16
Has a shunt resistor Rs connected to the collector of the power transistor 19, and a differential amplifier circuit 17 connected between both ends of the shunt resistor Rs and detecting the exciting current Im.

The control calculation unit 14 includes a rotation speed counting input port for receiving a crankshaft rotation speed Ne based on a crank angle signal detected by a crank angle sensor (not shown);
An A / D converter input port for taking in the load voltage Vd via the isolation amplifier 18;
7, an A / D converter input port for taking in the exciting current Im detected via the resistor 7, and a P for outputting a drive signal for opening and closing the power transistor 19 via a resistor R.
A WM drive output port.

The control operation unit 14 incorporates an A / D converter (not shown), and each A / D converter input port converts input data and converts the A / D converter in the control operation unit 14 into an A / D converter.
An interface circuit that enables the converter to read data is configured.

Further, as shown in FIG. 2, the exciting current Im supplied to the exciting coils 71 and 72 is of another exciting type, so that the constant current control by the control arithmetic unit 14 is possible. .

The control calculation unit 14 calculates a target output power Po based on the load voltage Vd and the crankshaft rotation speed Ne by using a target output power setting means for setting a map of the target output power Po of the generator 7 with respect to the load voltage Vd. Target torque To required by generator 7 to obtain (about 4.8 kg · m)
Torque setting means for setting a map of the generator, exciting current calculating means for calculating the exciting current Im of the generator 7 so that the required torque Tg of the generator 7 matches the target torque To, and the calculated exciting current Im. And exciting current control means for driving the exciting coils 71 and 72 in the generator 7 so as to be controlled. As a result, the required torque Tg of the generator 7 is controlled to be constant at the target torque To to reduce the output power Pg
In addition to the constant control at o, the engine 6 is operated at a crankshaft rotation speed at which the output efficiency of the engine 6 is maximized.

FIG. 3 is a characteristic diagram showing a characteristic curve of the required torque Tg and output power Pg of the generator 7 with respect to the load voltage Vd, and the solid line shows each variation of the required torque Tg and output power Pg before the constant control. Show. The dashed lines indicate the values of the target torque To and the target output power Po mapped by the first embodiment of the present invention.

As shown in FIG. 3, the lower limit value VL (28) at which the output power Pg becomes equal to or higher than the target output power Po (corresponding to the rated power).
With respect to the load voltage Vd in the range from about 0 V) to the upper limit value VH (about 400 V), the required torque Tg and the output power Pg are constant at the target torque To and the target output power Po of each map value (broken line). Controlled. It is assumed that the map values of the target torque To and the target output power Po are stored in a memory in the control calculation unit 14 in advance.

Next, the operation of the first embodiment of the present invention shown in FIGS. 1 and 2 will be described with reference to the flowchart of FIG. 4 together with FIG. First, the conventional operation before the constant torque control of the generator 7 will be described. Generally, assuming that the exciting current Im and the crankshaft rotation speed are constant, the required torque Tg and output power Pg of the generator 7 are as follows.
The load voltage Vd changes according to the characteristic indicated by the solid line in FIG.

That is, the required torque Tg and the output power Pg are respectively the median of the load voltage Vd ((VL + V
H) / 2), the characteristic curve becomes a peak and decreases on both sides indicated by the lower limit value VL and the upper limit value VH.

Therefore, if the output torque of the engine 6 to which the generator 7 is connected changes, the control of the crankshaft speed Ne by the throttle valve 4 alone delays the control of the intake air amount (control system non-response time). For this reason, the crankshaft rotation speed Ne hunts before the suppression of the rotation pulsation, which may cause deterioration of the engine efficiency and the exhaust gas.

Therefore, the first embodiment of the present invention shown in FIG. 2 has a configuration in which the control operation unit 14 can control the exciting current Im at a constant current. That is, the control calculation unit 14 determines the excitation coils 71 and 7 in the generator 7 according to the detected opening degree θ of the throttle valve 4, the crankshaft rotation speed Ne of the engine 6, and the load voltage Vd.
2 is determined.

In FIG. 4, first, the range of the load voltage Vd corresponding to the rated power of the generator 7 (the lower limit value VL to the upper limit value V
H), the map value of the target output power Po is set such that the output power Pg (and the required torque Tg) of the generator 7 is constant at the target value Po (and To) within this load voltage range. (Step S1).

Subsequently, the control calculation unit 14 calculates the load voltage Vd
And a target torque To required for the generator 7 to generate the output power Pg equal to the target output power Po based on the crank angle rotation speed Ne (step S).
2). Next, regardless of the variation of the load voltage Vd, the generator 7
So that the required torque Tg of
The exciting current Im supplied to the exciting coils 71 and 72 in the generator 7 is calculated (step S3).

Thus, in steps S1 to S3, the load voltage Vd, the crank angle rotation speed Ne, and the target torque T
The excitation current Im is calculated at regular intervals on the basis of o. Next, in order to actually obtain the calculated exciting current Im, the power transistor 19 of the driving unit 15 is opened and closed to generate the generator 7.
The excitation coils 71 and 72 in the inside are PWM-driven (step S4).

At this time, the stator coil 7 in the generator 7
The relationship between the output voltage Vg induced in No. 3 and the exciting current Im is represented by the following equation (1).

Vg = Pm · M · ωm · Im (1)

However, in the equation (1), Vg is the generator 7
, Pm is an armature constant indicating an output magnetic pole pair of the generator 7, M is an armature constant indicating mutual inductance, and ωm is a rotational angular velocity (= 2πNe / 60).
rad / sec) and Im is a field current, that is, an exciting current.

From equation (1), it can be seen that the exciting current Im corresponding to the PWM duty value is proportional to the output voltage Vg. Here, the exciting current Im is given by the following equation (2).

Im = VP / {Rf (1 + S · τr)} (2)

In the equation (2), VP is a PWM duty voltage, Rf is an equivalent resistance value of the exciting coils 71 and 72, S is a first-order lag operator of Laplace transform, and τr is a time constant of the exciting coils 71 and 72. It is.

As is clear from the equations (1) and (2), by making the PWM duty value variable, the exciting current Im becomes variable, and the required torque Tg and output power Pg of the generator 7 are controlled. It turns out that is possible.

In consideration of the above points, the excitation coil 7
In consideration of the temperature drift and the like of 1 and 72, the control operation unit 14 further measures the actual excitation current Im by the excitation current detection unit 16. Then, based on the difference between the calculated value of the excitation current Im and the detected value, the PWM duty value of the drive signal for the power transistor 19 is finely adjusted so that the required torque Tg of the generator 7 approaches the target torque To. Control is performed (step S5).

Thus, the generator 7 is controlled at a constant torque irrespective of the change in the load voltage Vd, so that the load does not change when viewed from the engine 6. Therefore,
Even when the load voltage Vd changes abruptly, the throttle valve 4 needs to be operated very slowly, so that the operability of the throttle valve 4 is improved and the engine 6 is operated at the point of maximum efficiency at the point of rotation speed. Can improve fuel economy.

As described above, the excitation current Im is constantly controlled from the rotation speed of the generator 7 corresponding to the crankshaft rotation speed Ne, the load voltage Vd, and the target torque To, and the load torque of the engine 6 is kept constant. The engine 6 can be controlled to rotate at a constant speed with almost no operation of the throttle valve 4. Therefore, it is possible to easily improve the efficiency of the engine 6, improve the fuel efficiency, and purify the exhaust gas.

The control operation unit 14 controls the engine control device 10 to, for example, purify exhaust gas.
The fuel injection amount is controlled so that the A / F (air-fuel ratio) always becomes the stoichiometric air-fuel ratio of 14.7. At this time, the engine 6
Since the opening degree θ of the throttle valve 4 corresponding to the intake air amount hardly changes, there is no need to apply acceleration / deceleration correction to the fuel injection amount, and therefore, it is possible to easily purify the exhaust gas.

Embodiment 2 FIG. In the first embodiment, only the control of the exciting current Im in the rated power range of the generator 7 has been described. However, the required torque Tg of the generator 7 is reduced to the target torque To or less due to a transient load change, and the power generation is performed. When the output power Pg of the machine 7 does not reach the rated power, the rotational up of the engine 6 may be prevented as follows. That is, within the rated power range of the generator 7, for the purpose of interpolating the control error between the target torque and the required torque,
The control range of the ignition timing that has been retarded and advanced may be increased, and the retard correction control may be performed on the ignition timing without moving the throttle valve 4 to the closing side.

For example, in the first embodiment, the exciting current Im of the generator 7 is controlled according to the variation of the load voltage Vd,
Since the constant torque control is realized, when the output power Pg of the generator 7 is generated at the rated power, the engine 6
Is substantially constant, and the amount of change in the throttle valve 4 is extremely small.

However, the load on the generator 7 is small,
When the output power Pg is less than the rated power, the required torque Tg of the generator 7 becomes equal to or less than the target torque To, so that the output torque Te of the engine 6 becomes lighter, and the rotational up speed occurs. Therefore, in order to suppress such rotational up of the engine 6, the throttle valve 4 must be moved to the fully closed side, and the exhaust gas purifying action is deteriorated.

Accordingly, with respect to the transient fluctuation of the rated power, the ignition timing of the engine 6 is corrected to be retarded without changing the throttle valve 4 to the closing side, and the output torque Te of the engine 6 is temporarily reduced. To reduce the rotational blow-up,
It is desirable that the crankshaft rotation speed Ne of the engine 6 be controlled to a constant rotation at the target rotation speed No.

In the second embodiment of the present invention in which the ignition timing is corrected at the time of a transient load change, the control calculation unit 14 determines whether the output power Pg of the generator 7 is equal to or higher than the rated power. Load fluctuation determining means for determining whether the voltage Vd is within a predetermined range (VL to VH);
When it is determined that d is not within the predetermined range and the output power Pg of the generator 7 is less than the rated power, the ignition timing of the engine 6 is delayed so that the crankshaft rotation speed Ne matches the target rotation speed No. And ignition timing correction means for correcting the angle.

FIG. 5 is a flowchart showing the ignition timing retard correction operation according to the second embodiment of the present invention. in this case,
After step S5 (see FIG. 4), the control calculation unit 14 determines whether the output power Pg of the generator 7 is equal to or higher than the rated power (that is, whether the required torque Tg is equal to or higher than the target torque To).
Is determined based on whether the load voltage Vd is within a predetermined range (VL to VH) (step S6).

If it is determined that the load voltage Vd is within the predetermined range (ie, YES), the routine shown in FIG. 5 is terminated. On the other hand, when it is determined that the load voltage Vd is not within the predetermined range and the output power Pg of the generator 7 is less than the rated power (Tg <To), the crankshaft rotation speed Ne matches the target rotation speed No. The ignition timing of the engine 6 is corrected so as to be retarded (step S7).

As described above, when the output of the generator 7 is less than the rated power, the efficiency of the engine 6 is instantaneously corrected by retarding the ignition timing of the engine 6 without moving the throttle valve 4. Although the opening degree decreases, the opening degree θ of the throttle valve 4 does not change, so that purification of exhaust gas can be easily improved.

Therefore, regardless of the power fluctuation due to the transient fluctuation of the load voltage Vd, the crankshaft rotation speed Ne is maintained so that the generator 7 has the optimum efficiency, and the engine is operated without operating the throttle valve 4. The constant output power Pg can be obtained while maintaining the point operation at which the efficiency of No. 6 is the highest. Further, even when the opening degree of the throttle valve 6 is slowly changed, the rotational pulsation of the engine 6 is suppressed to stabilize the crankshaft rotation speed with optimum efficiency, and the crankshaft rotation speed is changed even when the load 9 changes transiently. Several Ne can be stabilized.

Embodiment 3 FIG. In the second embodiment, the ignition timing of the engine 6 is retarded when the rated power is less than the rated power. However, the throttle valve 4 may be controlled to be closed at a relatively low constant speed. FIG. 6 is a circuit block diagram showing a specific configuration of the electronic control unit 30A, the drive unit 2, the actuator 3, and the throttle valve 4 according to the third embodiment of the present invention in which the opening degree θ of the throttle valve 4 is controlled. .

In FIG. 6, a drive position sensor 31 for detecting a drive position D of the actuator 3 is used as various sensors.
And a throttle valve 4 driven by an actuator 3
An opening sensor 41 for detecting the opening θ of the engine 6 and a pressure sensor (not shown) for detecting a boost pressure (in manifold pressure) of the engine 6 are provided.

For example, the drive position sensor 31 is constituted by a Hall element, and the opening degree sensor 41 is constituted by a variable resistor.

The drive unit 2 in the electronic control unit 30A for controlling the actuator 3
A three-phase full bridge including a PWM phase switching circuit 21 driven and controlled by a PWM control signal from a WM driving output port, and a transistor bridge for generating a driving signal for the actuator 3 based on the output signal of the PWM phase switching circuit 21 And a circuit 22.

The actuator 3 comprises a three-phase coil for rotationally positioning the throttle valve 4 in response to a drive signal. The electronic control unit 30A includes, as various types of information,
The drive position D of the actuator 3, the opening θ of the throttle valve 4, the load voltage Vd, the boost pressure PB of the engine 6, and the crankshaft speed Ne are taken in.

The opening degree θ of the throttle valve 4, the load voltage Vd, and the boost pressure PB are input to the control calculation unit 14 through an A / D input port, and the crankshaft rotation speed Ne is input through a rotation count input port. Is input to the control calculation unit 14. The drive position D of the actuator 3 is input to a PWM phase switching circuit 21 in the drive unit 2.

The control operation unit 14 determines whether or not the output power Pg of the generator 7 is equal to or higher than the rated power by determining whether or not the load voltage Vd is within a predetermined range. When Vd is not within the predetermined range and the output power Pg of the generator 7 is less than the rated power, the opening θ of the throttle valve 4 is closed so that the crankshaft rotation speed Ne matches the target rotation speed No. And an opening correction means for controlling at a constant speed.

As described above, when the output power Pg of the generator 7 is less than the rated power, the opening θ of the throttle valve 4 is shifted to the closing side so that the crankshaft rotation speed Ne matches the target rotation speed No. By performing the control, even when the load voltage Vd fluctuates and the output power Pg does not reach the rated power, the rotation pulsation of the engine 6 can be suppressed and the constant rotation can be controlled.

Thus, before the required torque Tg of the generator 7 decreases due to the reduction of the load, the throttle valve 4 is controlled in advance to the closing side, the rotational pulsation of the engine 6 is suppressed, and the constant rotation control is performed. Achieve efficiency, low noise, and exhaust gas purification. Further, the control calculation unit 14 performs the point operation of the engine 6 at the crankshaft rotational speed of the highest efficiency,
Feedback control of the crankshaft rotation speed Ne is performed.

In this case, the control operation unit 14 constantly compares the detected opening degree θ of the throttle valve 4 with the target opening degree θo calculated in the control operation unit 14, and calculates D-PI (proportional integral- (Preceding differentiation) control, and the deviation between the two is input to the PWM phase switching circuit 21 in the drive unit 2 as a PWM duty value.

As a result, the throttle valve 4 is driven to open and close via the actuator 3, and the crankshaft speed Ne of the engine 6 can be arbitrarily increased or decreased according to the amount of change in the PWM duty value. At this time, since the opening degree θ of the throttle valve 4 is driven at a relatively low speed and does not change suddenly, the exhaust gas does not deteriorate.

FIG. 7 is a characteristic diagram showing the relationship between the output voltage Vg and the output current Ig of a general three-phase synchronous generator 7, and includes output voltage ranges V0 to V1 and output current ranges A0 to A0.
A1 indicates a range in which the rated output voltage of the generator 7 can be obtained when the load changes.

FIG. 8 is a characteristic diagram showing a relationship between the opening degree θ of the throttle valve 4 and the required torque Tg of the generator 7 and the load voltage Vd of the generator 7 controlled by the third embodiment of the present invention. Is controlled to the closing side at a reference voltage Vd1 or higher, and the required torque Tg of the generator 7 is reduced at a reference voltage Vd2 or higher.

FIG. 9 is a characteristic diagram showing in chronological order the change timing of the load voltage Vd, the opening degree θ of the throttle valve 4, the exciting current Im and the crankshaft rotation speed Ne along with the elapsed time t. The time τ corresponds to an interval from the timing to start closing the opening θ to the timing to start decreasing the exciting current Im.

FIG. 10 is a flow chart showing the operation of the third embodiment of the present invention. Step S8 of the opening θ and step S9 of the required torque Tg of the generator 7 are inserted after step S5 in FIG. The following shows the case.

Hereinafter, referring to FIGS. 7 to 10, FIG.
The advance control operation of the throttle valve 4 according to the third embodiment of the present invention shown in FIG. 6 will be described in more detail. Here, as described above, the output power P of the generator 7 is
Only the case where the throttle valve 4 is controlled to the closed side when g is less than the rated power to suppress the rising and pulsation of the crankshaft speed Ne of the engine 6 will be described.

Generally, the characteristics of the output voltage Vg and the output current Ig of the generator 7 are as shown in FIG. At this time, the range V in which the rated power can be obtained when the output voltage Vg and the output current Ig fluctuate from the structural specifications of the generator 7 and the like.
0 to V1 and A0 to A1 are restricted.

Here, since the constant torque control is performed with the generator 7 being separately excited, the throttle valve 4 needs to be controlled only when the load of the generator 7 has decreased to the amount of consumption below the rated power. . At this time, as is apparent from FIG.
When the output current Ig, that is, the load current decreases, the output voltage Vg tends to increase.

Therefore, as shown in FIG. 8, the reference voltages Vd1 and Vd2 are mapped in advance in the control calculation unit 14, and the opening of the throttle valve 4 is set when the load voltage Vd reaches the reference voltage Vd1 or higher. is decreased to the closing side, and when the load voltage Vd reaches the reference voltage Vd2 or more, the required torque Tg of the generator 7 is reduced.

At this time, the reference voltage Vd1 for closing the opening degree θ of the throttle valve 4 is mapped to a value lower than the reference voltage Vd2 for reducing the required torque Tg of the generator 7, and the throttle valve is set. 4 is controlled to decrease earlier than the required torque Tg of the generator 7.

That is, in FIG. 10, first, the load voltage Vd is compared with the reference voltage Vd1, and it is determined whether the load voltage Vd is equal to or higher than the reference voltage Vd1 (step S61).
If it is determined that Vd <Vd1 (that is, NO), the process proceeds to the next determination step S62, and if it is determined that Vd1 ≦ Vd (that is, YES), the crankshaft rotation speed Ne of the engine 6 becomes equal to the target rotation speed. The opening θ is corrected to the closing side so as to coincide with No (step S8).

Subsequently, it is determined whether or not the load voltage Vd is equal to or higher than the reference voltage Vd2 (step S62).
If it is determined that d2 (that is, NO), the routine of FIG. 10 is terminated, and if it is determined that Vd2 ≦ Vd (that is, YES), the exciting current Im is corrected so that the required torque Tg of the generator 7 is reduced. (Step S9).

As is apparent from FIG. 9, which illustrates the above operation in a time series, the opening θ of the throttle valve 4 is
Because the shift to the closing side is made earlier than the decrease timing of the exciting current Im corresponding to the required torque Tg, the delay of the intake air amount and the non-response time of the control system are offset. Therefore, it is possible to suppress the rotational speed of the engine 6 from rising.

Here, the delay of the intake system and the combustion delay of the engine 6 (dead time tL) are calculated by subtracting
Assuming that the intake system delay is a fixed time and the dead time tL is made up of three strokes of an intake stroke, a compression stroke, and a combustion stroke, the dead time tL is equal to 1.5 revolutions of the engine 6. Therefore, the dead time tL is inversely proportional to the crankshaft rotation speed Ne and is expressed by the following equation (3).

TL = (60 × 1.5) / Ne (3)

Regarding the actual control, the dead time tL is
Considering the time change of the crankshaft rotation speed Ne, it is approximately regarded as a first-order lag, and is expressed as the following equation (4) as a function of the dead time tL using the Laplace operator S.

Exp (−tL · S) ≒ 1−tL · S ≒ 1 / (1 + tL · S) (4)

As shown in FIGS. 8 and 9, the throttle valve 4
Of the generator 7 is required torque Tg of the generator 7 (excitation current Im)
By performing the control earlier than the above, the rotational upflow and rotational pulsation of the engine 6 are suppressed, so that the noise reduction of the engine 6 and the purification of the exhaust gas can be easily realized.

Embodiment 4 FIG. In the third embodiment in which the advance control of the throttle valve 4 is performed, the required torque Tg of the generator 7 is set.
When the opening degree θ of the throttle valve 4 is changed before changing the (excitation current Im), the delay time of the intake system of the engine 6 is offset, but the position of the target opening degree θo to be shifted by the preceding control is ambiguous. On the contrary, the crankshaft rotation speed Ne of the engine 6 may be reduced.

Therefore, it is desirable to calculate the map value of the required torque Tg so that the deviation (torque margin) between the output torque Te of the engine 6 and the required torque Tg of the generator 7 always becomes a constant value. That is, the target torque To of the generator 7 is controlled by the microcomputer in the control operation unit 14.
It is sufficient to estimate the output torque Te of the engine 6 according to the above, and to fix and control the throttle valve 4 to the opening θ based on the estimated engine output torque Te.

A fourth embodiment of the present invention for performing the estimation of the engine output torque Te and the map interpolation calculation of the target opening θo will be described below. The block configuration of the electronic control unit 30A according to the fourth embodiment of the present invention is as shown in FIG.

In this case, the control operation unit 14 includes an output torque estimating means for estimating the output torque Te of the engine 6 based on the detected opening degree θ and the boost pressure PB, a required torque Tg of the generator 7 and the engine 6. And a target opening calculating means for performing a map interpolation calculation of the target opening θo of the throttle valve 4 based on the relationship with the output torque Te.

Therefore, the opening correction means adjusts the opening θ of the throttle valve 4 so that the crankshaft rotation speed Ne matches the target rotation speed No when the output power Pg of the generator 7 is less than the rated power. The target opening degree θo is controlled. Thus, before the required torque Tg of the generator 7 decreases due to the reduction of the load, the throttle valve 4 is precedently controlled to the closing side, and the rotational pulsation of the engine 6 is suppressed to perform constant rotation control, thereby increasing efficiency. Achieve low noise and exhaust gas purification.

Thus, the target torque To of the generator 7
Even if the output power (corresponding to the output power Pg of the generator 7) changes, the opening degree θ is always shifted to the optimum opening degree by the advance control, so that the rotational upflow and pulsation of the engine 6 can be suppressed. Next, FIG.
Fourth Embodiment A process of estimating an engine output torque Te and a process of calculating a map interpolation of a target value θo of an opening degree θ according to a fourth embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 11 is a characteristic diagram showing the relationship between the crankshaft speed Ne of the general engine 6 and the output torque Te. The boost pressure PB changes from the atmospheric pressure WOT (opening θ is fully open) to the opening θ. -100mmH corresponding to the fully closed direction of
It is converted into map data in units of g to -400 mmHg.

FIG. 12 is a characteristic diagram showing the relationship between the output torque Te of the engine 6, the required torque Tg of the generator 7, and the crankshaft rotation speed Ne.
deviation from the required torque Tg of the generator 7 (allowable torque)
Is calculated so as to be constant not only for the point operation rotation speed Np at which the maximum efficiency is obtained but also for all crankshaft rotation speeds Ne.

FIG. 13 is a flow chart showing the operation of the fourth embodiment of the present invention.
8 shows a case where an output torque estimation step S81, a map interpolation calculation step S82 of the target opening degree θo, and an opening degree correction step S83 are inserted instead of the step S8.

Control operation section 1 in electronic control unit 30A
Reference numeral 4 stores map data of the crankshaft rotation speed Ne and the output torque Te of the engine 6 in advance for each boost pressure PB as shown in FIG.

In FIG. 13, first, the microcomputer in the control / operation unit 14 determines Vd in step S61.
If it is determined that 1 ≦ Vd (the output power Pg of the generator 7 is less than the rated power), the engine 6 is controlled based on the crankshaft rotation speed Ne and the boost pressure PB based on the map data in FIG. The output torque Te is estimated (step S81).

The engine output torque Te estimated at this time is statically invariable as a value specific to the engine 6 because the throttle bore diameter, cylinder volume, and exhaust volume are all fixed values.

Subsequently, the estimated engine output torque T
e, the target opening θo is determined based on the target opening θo.
With the engine output torque Te and the target torque T of the generator 7
The map interpolation calculation is performed based on the relationship with o (step S8).
2). That is, the target opening degree θ is determined based on the deviation of the crankshaft rotation speed Ne after the required torque Tg of the generator 7 changes.
o is learned each time and the map data is corrected.

Subsequently, the opening θ of the throttle valve 4 is corrected to the target opening θo such that the crankshaft rotation speed Ne matches the target rotation speed No. As a result, a more accurate constant rotation control of the engine 6 can be realized.

[0120]

As described above, according to the present invention, the throttle valve for adjusting the intake air amount of the engine, the engine control device for controlling the fuel injection amount and the ignition timing for the engine, and the opening degree of the throttle valve are adjusted. An actuator that generates power by using the rotation output of the engine,
Based on a rectifier circuit that rectifies the output voltage of the generator to generate a DC load voltage, a load to which the load voltage is applied and the output power of the generator is supplied, and various information indicating an operating state of the engine. An electronic control unit that controls an exciting current for the generator, an engine control device and an actuator, and various kinds of information include a load voltage corresponding to a resistance value of the load and a crankshaft rotation speed of the engine; A target output power setting means for setting a map of a target output power of the generator with respect to the voltage; and a target for setting a map of a target torque required by the generator to obtain the target output power based on the load voltage and the crankshaft rotation speed. Torque setting means, and exciting current calculating means for calculating the exciting current of the generator so that the required torque of the generator matches the target torque; And a magnetizing current control means for exciting current for driving the power machine of the exciting coil so as to obtain a,
The required torque of the generator is controlled to be constant at the target torque, the output power is controlled to be constant at the target output power, and the engine is operated at a crankshaft rotation speed at which the output efficiency of the engine is maximized. As a result, if the output power of the generator can output the rated power, the generator is controlled at a constant torque regardless of the load fluctuation, and the load torque seen from the engine is kept constant without controlling the opening and closing of the throttle valve. A control system for an engine generator that maintains rotation speed and pulsation by maintaining the engine's crankshaft rotation speed, optimizes engine efficiency, reduces noise, improves fuel efficiency, and easily purifies exhaust gas. Has the effect.

Further, according to the present invention, the exciting current detecting means for detecting the exciting current supplied to the generator, and the exciting current for finely adjusting the exciting current based on the difference between the detected value of the exciting current and the calculated value. Correction means is provided to finely adjust the excitation current based on the difference between the detected value of the excitation current supplied to the generator and the calculated value, thereby compensating for temperature drift and the like. Is more reliably suppressed, and an engine generator control device that achieves optimization of engine efficiency, reduction of noise, improvement of fuel efficiency, and easy purification of exhaust gas can be obtained.

Further, according to the present invention, load fluctuation determining means for determining whether or not the output power of the generator is equal to or higher than the rated power based on whether or not the load voltage is within a predetermined range; And when the output power of the generator is determined to be less than the rated power, an ignition timing correction means for correcting the ignition timing of the engine such that the crankshaft rotation speed matches the target rotation speed is provided. Since the change in the opening of the throttle valve is suppressed, the engine is controlled at a constant speed with little operation of the throttle valve even during transient power fluctuations, and when the opening of the throttle valve changes slowly. However, engine pulsation can be stabilized by suppressing the engine's rotational pulsation and stabilizing the crankshaft rotational speed with optimum efficiency, and also improving engine efficiency and fuel efficiency and easily purifying exhaust gas. The effect of the control device can be obtained.

Further, according to the present invention, load fluctuation determining means for determining whether or not the output power of the generator is equal to or higher than the rated power based on whether or not the load voltage is within a predetermined range; And when the output power of the generator is less than the rated power, the opening correction means for controlling the opening of the throttle valve to the closing side at a constant speed so that the crankshaft rotation speed matches the target rotation speed. The throttle valve is controlled to open and close at a constant speed when the output power of the generator does not reach the rated power due to load fluctuations, so the pulsation of the crankshaft speed of the engine is suppressed and the engine efficiency is optimized. In addition, there is an effect that a control device for an engine generator that can easily improve fuel efficiency and purify exhaust gas can be obtained.

According to the present invention, the output torque estimating means for estimating the output torque of the engine based on the opening degree and the boost pressure, and the throttle based on the relationship between the required torque of the generator and the output torque of the engine. A target opening calculating means for performing a map interpolation calculation of the target opening of the valve, and providing a throttle so that the crankshaft rotation speed matches the target rotation speed when the output power of the generator is less than the rated power due to a load change. Since the valve opening is controlled to the target opening, the throttle valve is controlled ahead of time to the closing side before the required torque of the generator decreases due to the reduction of the load, and the engine rotation pulsation is suppressed and maintained constant. It is possible to obtain a control device for an engine generator that can control the rotation, optimize engine efficiency, improve fuel efficiency and easily purify exhaust gas. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a control device of an engine generator corresponding to Embodiments 1 to 4 of the present invention.

FIG. 2 is a circuit block diagram showing a specific configuration of an electronic control unit and a generator in FIG. 1 according to Embodiment 1 of the present invention.

FIG. 3 is a characteristic diagram illustrating a relationship between a required torque and output power of a generator and a load voltage for explaining an operation of the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating an operation of controlling an exciting current according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing an ignition timing correction operation according to Embodiment 2 of the present invention.

FIG. 6 is a circuit block diagram showing a specific configuration of an electronic control unit, an actuator, and a throttle valve in FIG. 1 according to Embodiment 3 of the present invention.

FIG. 7 is a characteristic diagram illustrating a relationship between an output voltage and an output current of a generator for explaining an operation of a third embodiment of the present invention.

FIG. 8 is a characteristic diagram illustrating a relationship between a throttle valve opening, a required torque of a generator, and a load voltage for explaining an operation of the third embodiment of the present invention.

FIG. 9 is a characteristic diagram showing a load voltage, a throttle valve opening, an exciting current of a generator, and a change over time of a crankshaft rotation speed for explaining an operation of a third embodiment of the present invention.

FIG. 10 is a flowchart showing a throttle valve control operation according to Embodiment 3 of the present invention.

FIG. 11 is a characteristic diagram illustrating a relationship between an engine output torque and a crankshaft rotation speed for each boost pressure unit for explaining the operation of the fourth embodiment of the present invention.

FIG. 12 is a characteristic diagram illustrating a relationship between an engine output torque, a required generator torque, and a crankshaft rotation speed for explaining an operation of the fourth embodiment of the present invention.

FIG. 13 is a flowchart illustrating an operation of estimating an engine output torque and an operation of interpolating a target opening according to a fourth embodiment of the present invention.

FIG. 14 is a block diagram showing a schematic configuration of a conventional engine generator control device.

FIG. 15 is a circuit block diagram showing a specific configuration of an electronic control unit and a throttle valve in FIG.

[Explanation of symbols]

Reference Signs List 3 actuator, 4 throttle valve, 6 engine, 7 generator, 71, 72 excitation coil, 8 rectifier circuit, 9 inverter circuit (load), 10 engine controller, 16 excitation current detector, 30A electronic control unit, Im excitation current , Ne Crankshaft speed, No
Target rotation speed, PB boost pressure, Pg generator output power, Po target output power, Te engine output torque, Tg generator required torque, To target torque, Vd
Load voltage, Vg Generator output voltage, θ Throttle valve opening, θo Target opening, S1 Target output power setting step, S2 Target torque setting step, S3 Magnetic current calculation step, S4 Excitation current control step, S5 Excitation current Correction step, S6, S61, S62 Load fluctuation determination step, S7 Ignition timing correction step, S8, S
83 opening correction step, S81 output torque estimation step, S82 target opening calculation step.

Claims (5)

(57) [Claims] A throttle valve (4) for adjusting an intake air amount of an engine (6); an engine control device (10) for controlling a fuel injection amount and an ignition timing for the engine; actuator (3) for adjusting θ), and a generator (7) for generating electric power by the rotation output of the engine
A rectifier circuit (8) for rectifying an output voltage (Vg) of the generator to generate a DC load voltage (Vd); and an output power (P) of the generator when the load voltage is applied.
g), and an electronic control unit (30A) for controlling the exciting current (Im) for the generator, the engine control device and the actuator based on various information indicating the operating state of the engine. The various information includes a load voltage (Vd) corresponding to the resistance value of the load and a crankshaft rotation speed (N
e) wherein the electronic control unit comprises: a target output power (P
o) target output power setting means for setting a map, and based on the load voltage and the crankshaft speed.
Target torque setting means for setting a map of a target torque (To) required by the generator in order to obtain the target output power; and generating the power so that the required torque (Tg) of the generator matches the target torque. Exciting current calculating means for calculating an exciting current of the generator; and exciting current control means for driving an exciting coil in the generator so as to obtain the exciting current, wherein a required torque of the generator is fixed at the target torque. A control device for an engine generator, wherein the output power is controlled to be constant at a target output power, and the engine is operated at a crankshaft rotation speed at which the output efficiency of the engine is maximized. 2. An electronic control unit comprising: an exciting current detecting means for detecting an exciting current supplied to the generator; and a fine adjustment of the exciting current based on a difference between a detected value of the exciting current and a calculated value. 2. The control device for an engine generator according to claim 1, further comprising: an exciting current correction unit that performs the operation. 3. The load control device according to claim 1, wherein the electronic control unit is configured to determine whether the output power of the generator is equal to or higher than a rated power based on whether the load voltage is within a predetermined range. Is not within the predetermined range, and when it is determined that the output power of the generator is less than the rated power, the ignition timing of the engine is adjusted so that the crankshaft rotation speed matches the target rotation speed (No). 3. The control device for an engine generator according to claim 1, further comprising an ignition timing correction means for correcting. 4. The load control circuit according to claim 1, wherein the electronic control unit is configured to determine whether or not the output power of the generator is equal to or higher than a rated power by determining whether or not the load voltage is within a predetermined range. Is not within the predetermined range, and when the output power of the generator is less than the rated power, the opening of the throttle valve is adjusted so that the crankshaft rotation speed (Ne) matches the target rotation speed (No). 3. The control device for an engine generator according to claim 1, further comprising an opening correction means for controlling a constant speed on a closing side. 5. The various information includes an opening degree (θ) of the throttle valve and a boost pressure (PB) of the engine, and the electronic control unit controls the engine based on the opening degree and the boost pressure. An output torque estimating means for estimating an output torque (Te); and a target opening (θ) of the throttle valve based on a relationship between a required torque of the generator and an output torque of the engine.
and o) a target opening calculating means for performing a map interpolation calculation, wherein the opening degree correcting means sets the crankshaft rotation speed (Ne) to the target rotation speed when the output power of the generator is less than the rated power. 5. The engine generator control device according to claim 4, wherein the opening of the throttle valve is controlled to the target opening so as to coincide with (No).